Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 159)

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Visualize Data with Symbols
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Scale Box
In the Scale Box, set the scale ranges for all tags.
Single Y Scale Combines all Y tag value ranges onto one scale.
Multiple Y Scales Provides a separate scale for each Y tag. This choice does not change
the scale min and max values, but allows them to be configured
independently by selecting each Y tag and making changes.
Regardless of your selection, you may independently configure the X
scale tag.
Max Autorange uses the maximum value plotted. You may enter an
absolute value here as well. Default is Autorange. Database uses the
zero plus span value of the tag in the FactoryTalk Historian Archive to
determine the max. Database with a data set plot uses the maximum
value plotted.
Min Autorange uses the minimum value plotted. You may enter an
absolute value here as well. Default is Autorange. Database uses the
zero value of the tag in the FactoryTalk Historian Archive to determine
the min. Database with a data set plot uses the minimum value
plotted.
Format Selects the number format of the Y scale, legend entries, cursor
values, and ToolTip values:
 Database
Database format uses the displaydigits FactoryTalk Historian point
attribute to determine how many decimal places to show. If the
length of the number exceeds the displaydigits value, scientific
notation is used. FactoryTalk Historian ProcessBook trims trailing
zeroes that follow a decimal point. The Database format option is
intended for use with FactoryTalk Historian tags only.
 General
Shows all significant digits for a number except trailing zeros. If
the absolute value of the value is greater than 1e+7 or less than
1e-5, the format will switch to use scientific notation.
 Scientific
Most useful with very large numbers. The scientific format used for
trends displays in the format: 0.00E+00.
 Custom (#,##0.00, 0%)
Allows you to enter your own number format. See the
Table of
Format Values (page 340) for examples.